I am not biased in anyway. Makes no difference to me which scope you buy, if any.
Of course if you do want to be a "Proper Diagnostician" the man that gets it right first time every time then you will need a good scope. To my knowledge the Pico + Autonerdz combination will be hard to come close to.
If you have watched Paul Danner's Videos then I suspect you have already seen the benefits of having a Pico.
This would be new to me so I'm a little hesitant in spending money for fear of not using it. What to do? Maybe those of you who felt like me and have actually bought one can help me out here
That would me some time ago. Today I scope everything !!! I use a Fluke 123 Scope as my handheld Voltmeter & Scope and if I need more detail & accuracy out comes the Pico. (Being Mobile it is more convenient that way) If I was Workshop based I would switch the Pico on first thing and leave it running all day.
If you think that you can buy a scope and hit the ground running with it then then you would be wrong.
You will have to invest hours and hours learning how to use it, practice, practice, practice and one day soon become a Master Scope Jockey. Practice on good and bad cars, read the technical articles, more videos. It doesn't take long but you will have to commit time to it. And believe me it will be worth the Effort.
Take a look at the Case Studies on this forum, there is some mind blowing stuff in there.
One last thing, get all the accessories to go with it. The accessories make fixing cars a fun thing, what the scope can do is limited only by your imagination and the accessories.
And as Andrew says, 4 channels. Even then you will find yourself wanting more.